Home
Back
Formula Used:
| From: | To: |
The velocity of flow at radial distance represents the speed at which groundwater moves through a porous medium at a specific radial distance from a well or other point of interest, calculated using Darcy's Law.
The calculator uses the Darcy's Law formula:
Where:
Explanation: The equation calculates groundwater velocity based on the hydraulic gradient and the material's permeability characteristics.
Details: Accurate velocity calculation is crucial for groundwater flow analysis, contaminant transport studies, well design, and aquifer characterization.
Tips: Enter coefficient of permeability in m/s, change in piezometric head in meters, and change in radial distance in meters. All values must be positive.
Q1: What is the coefficient of permeability?
A: The coefficient of permeability measures the ability of a porous material to transmit fluids through it, quantifying how easily water can flow through the material.
Q2: What is piezometric head?
A: Piezometric head represents the hydraulic head or water pressure at a specific point in an aquifer, measured as the height of water above a datum.
Q3: What are typical values for coefficient of permeability?
A: Values range from 10⁻¹² m/s for clay to 10⁻¹ m/s for gravel, depending on the porous medium.
Q4: When is this calculation most useful?
A: This calculation is particularly useful in radial flow systems around pumping wells and for analyzing groundwater movement in confined aquifers.
Q5: Are there limitations to Darcy's Law?
A: Darcy's Law assumes laminar flow and is valid for Reynolds numbers less than 1-10. It may not accurately represent flow in very coarse materials or under high velocity conditions.